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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd042122aa605e6bfa3c14de4639214fb850a35364e24d1a352596afe14c9c069' 
  AND token = 'kdrcNwLzWw31qjiWpS088/yB6E0FD2FcnVwY2AFlLTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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