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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9237050c880e824706d81cfdff00e9acf0394f0155dbdd38a59bf1e4f03d7b8a' 
  AND token = '3eFTqqwEPw60gJ0VtMmEzRjL74ihts1g/dTQr9fj6Eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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