SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00299b86255d87bb92ea28b8e846ad9606f9efaf000b64450ab154c95dbd4271' 
  AND token = 'LgQwpYOjO75Jvhl/RHVoSOazSGRW5NgI5VL3/tSn0IM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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