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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '60719268a59252b8b858eebe51c3625f3855f85773e771bb745baf76141bcb13' 
  AND token = 'DBV91sBnGQn5gILLfAfNHqp5blQt6bpvU9fe5wSsAGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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