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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0cc4164af8773082bd7e94ce7daed6543cc47d0a5fac9a9998c9c2e014356ae5' 
  AND token = '0HLQ+OgrD5ob6wZgB058bV10X6GZqeC1bEpi1R6l3ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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