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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db4846c277efdb49a2658d06a839aa1915c6d55a60c0e5994c0d71176c6e55c5' 
  AND token = 'oTNPCxikU5QLmxksuca2iprkrWiGP4x4I1J9z10w2hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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