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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b9cebcbbb9858acfff578c90e675c44ee9eb5bcc9a71a55831584f440ca4f18' 
  AND token = 'ImO+vmRs10P3ekauSywwvP8mfJvoeYgPJSx37oUOrFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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