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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6baccfba823726ac0fa8d850700e336eb97d9250f60da79aa9596042d5a23fda' 
  AND token = '5XNeeq8Pe38plYxy9kUgt2YeHCEpeF4hC3yDFIHbVMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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