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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e464b4eb3da5db5d7d2c855094bedcc4872ff1ac109ac6a4749f39fb2b678655' 
  AND token = 'K9bpo6R0/b99nO/6vRkv7inSkfq5q2r1PPAz2Duq/8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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