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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f0eeb1736b5102002c55663d6da045f84c3af1e9bab3175a4c1be5f5320098c3' 
  AND token = '9Np3sRXdfUVEEGaYmJcDK/TKMw9Pppr58yq/1Ex9FrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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