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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c544bc554c0b8a620cbfefa052e0feb6c900e672f6a6394dd30b26f8e5626bb3' 
  AND token = 'V9rfMxS/FzqL8IwMajaoUEg0tx+39l7YrHTD5TZvTeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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