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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa7ff1bd0b2eb74846c6bd20ca6fbc815acc3f7c01619fc831c0cb3a64bdf804' 
  AND token = 'fVfw1WRaFJC8pb1sL87E5O8zuKo5acnS3MOmCftsl9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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