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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2941794b20691736b5847e602316d2febaad5c799cec90d43cadc4cfe2be6ff' 
  AND token = '2kAchhvfbdjozOr0Ssvhsj06imyAcvegFWQWKi7DRs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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