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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c7cab7dfc2e00ebe41632901e6a6bc150a07268bfff2eaebd2148b83d6dc02f' 
  AND token = 'lX/K9P7ogJmh88k+hp7idlKk8CmGtEEqMDvRsAcQ7qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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