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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c647067ffab0c9759800ef56831fc500d4fb51499f6afc5f6f5b250404116db' 
  AND token = 'O4qawDe4H80L6ofXo4VQTP14JcoO3RlXmwQkEdaVkpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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