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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bef0880cf6a2c5e5795e93c27e2d48007ac2679fa7672259768ecb646a59b0c4' 
  AND token = '79XeS8y8Y+QD0vyGJIW41FaYaKgZQ73OpoHj/lN/4Lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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