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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '986c0aabf171d0c09dece3867f8fb4c22261c8f69f4f9fac4237d0c86543788f' 
  AND token = 'pDt1cMvfHq9VttWTCvEG7UTD1zSuttEU8bG1J4p4gAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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