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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5691b7582fb07a292ec6459c3b425e61fdc11a6812e70816cc83d0c1c4c273e9' 
  AND token = 'CwfiEY91GghPGfCTDD/KrCt/eCS4mlxZpe7uUGT1peE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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