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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fdeeb2ad73add6b0b4961d74fbe6eca8f883b547d6f5a519ca5cb26e872f13ee' 
  AND token = 'waqQMGNC684thped80l5BZqd7l+XxSp5u4zjPszXcBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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