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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf1b2fe9f93946430b0ead1fef2476855f3b8cfd9421e4bfbc1bc0e5f00f160a' 
  AND token = '4PmeLkwbcUy3VRi7dkLd9bjARDMuqjyUYAVrsOEsfuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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