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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42ed46935e8c6e919f25dd2a009feee29d74a0bab4cdf0015662fb40605639c7' 
  AND token = 'DorpfhXFyT4GKlWkg5UNR4ZItRZ4M8N3dygoKuyD4QI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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