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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f29d49eeab9c03354d48e8761155ce0359e00135ce44854f54d447c4ae62b5e' 
  AND token = 'DKwC8TAF9M6YIfK/UfyOmw4qAswTKuglD5p9wTh/CGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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