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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '39026f3de7fa83ce5107023f3bff833ff680f4cb488ff5ba8a32af4fee3600c5' 
  AND token = 'EnZjD0gM8qu+6Hrj8yDqaXXvVF6o2vvcvecNdAOxqTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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