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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2df8426f8e1d53fbcffb0f33bc9afd1181e6599f0a1598230457fc523a459420' 
  AND token = 'lZ1favOHAFGcKTBpnhFgeYevaFta/7Oez6INAm0ryD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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