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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c1ebb8c57bd8d5ca5cc2e32924275766a5bdbd68ce9cae549db8e3815846f571' 
  AND token = 'iPG23eK0kh1oa1uJY5pHo9T6u/T8vMlRk5gYwdw0tMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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