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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '799744a2fcc3bc5a3ff207ccfb26acbf050a06a12fe44bd6743ac3c60cbf27df' 
  AND token = 'b+ntuz9oUScjc9+bEZN7CSNAKwWs5o1CjW6MfAesRJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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