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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b2f482efe4d8373be6b234f74c94e9322c52de9308d684b436acc09b3b38dd5d' 
  AND token = 'oncdV8gOJO39Oj8rSLg1+djKnbICEU7IrIn1RbjPT/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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