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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a1f2896a0ee9d4682fc79abdd1a22bb264acc581e36f5719b66668a94255e914' 
  AND token = 'D2rsnpoowblr2pl2O+Lr3geU6b+nEdym0IRGQM7Oljo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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