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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c78b43b1d39bef6c47daee3d1a153a6087421d7fffdd39cf61c4e36acccea4f8' 
  AND token = 'mx10Cbse7HFprBPYhkW3GDWJ2LbeL0dTGo0ifw+ih6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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