SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf839a7473d42931c13061c7e427b822e0245c235a8944c0f8ba69bd4eb9abf4' 
  AND token = 'TDN2g0e8vJP4sgh5F2EEXrQviqB6sldzafGlTq/Z1y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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