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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7bbe3c157c62ed1dbd2d1d8b7e58bb68653b5af70ab90875f5b2ec8004475de1' 
  AND token = 'XYFY5IJClaZA2hsoAlj0cJBpZIKDjJEXBgYEvt7YmAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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