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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3db5813e412c7b84087424925859f5335eb93429ff4bb45847058b4f5f797045' 
  AND token = '9XfR09QQmlJT2FXbawl449n9+ZmSvGvNUruf6wQvFsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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