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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0982ed051dca4991966e3adc57f838a95750d07db3152c1ef260a46ded1805be' 
  AND token = '2s3fuKlK+es/2dTNrKWYe6bZo37CB1FUDR8a/T6+T9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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