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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d2bf0b35d7cfb48c16be25ec0643e613bdc1e26153d935edaaeddcf6653af3e' 
  AND token = 'IJtaosKmqL6gTL7zrXBwJfPDVmWcciSNxT0azSvh0qQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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