SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a41eaf5869da73c1bea048e5122b22c1ba5b3523285befe48975f0d9081717eb' 
  AND token = 'h9HI29hod/vgGg9URQB+vbVYKEzUQm6cssgDVYTqw3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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