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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a55dd5d2569a982600af7d3df6bc09f05d26d74be773ce892b8bae80ab9c1980' 
  AND token = 'nyPZVzet2AiUbIW4UvqEHKuJOtdkKhMpwIi3nUo6yeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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