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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62453969e5c397f7383e5f93cf8e9131b73b363d2bc04d90ba18d5059ecff850' 
  AND token = 'z2V2d8jENvaAVBMHIMv+0DSNucnb+a+L6LnS4bgfTfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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