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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb9f1426d745dd31f79994cc83ee19c44d238d1f7dc39e87dace0a584781a23d' 
  AND token = '7pAFcE4G/JaPlUbWv8VYeS4lpXktCJ5OMPyK1gfbwyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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