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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce4d1c340985447be88b5fed8be7a7937b51c3b1be8bd668f2fdcb3a95736884' 
  AND token = 'rCASTxbWG1r6jSUlaLnGHvVIr0FC/7UMzITn1OyHmmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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