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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba6609f882a437fce1c396f03af02d72212ac46c88d4f5c4b22b61e542dcd6c0' 
  AND token = 'rrVfHN4BrMMGI2TTRntMmeVXxdzCkcFnyvPZ7zTiSvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}