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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd54fac3c7b8c9ffdf6dcfc6b6750a0d8567d84cc46e1c467ec534a7f8b6346a1' 
  AND token = 'BkOgaX9gHnDqd6936G7nx5I+P4WTfu+wOkVaGENZYcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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