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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf9afe137105fa1905a7b2fd7a50d84310324c7d5d986bf88f9de48b2714e716' 
  AND token = 'vui6DFgAx2Ij1T58p1yRh/30tuKIwC51Xxao4UGklSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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