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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f60e3d31c056f712b2b36462ef3128528bbdd1f48bba19e946c31fee93122d76' 
  AND token = 'X5te2NOpHNVAHm/90ZLor0J3ubvrxuqLh0s98dUxmu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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