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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8117d28858330a0b7feb35767ede16bdd8eb0cda2f2b22d1abb43e20403c5419' 
  AND token = '5LO2JJnHcHe8OjzzASQS8rI2gV5uM9yUjnLBtTkLjXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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