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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2084fd929d8c96be74326624b2c79fb741ebab9dd844288479797fbcebe0b256' 
  AND token = 'St8NWN1p4dEzetaNLx3pSPCPE7EBaBpwMeoX4quceT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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