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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '14fba96aa8c2cd3b77a0d87e29d1bb382833017cec6ffab8fee98802bb4a9e42' 
  AND token = 'q802Klhew94G2/E3W6oIyTJyQoRC0RoLg79Ecd70Q9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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