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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c1027e9d3f6a38901f1cfc46d9e53057a1ca5829387a98db132de5be0357760' 
  AND token = 'iAI/BClnsltAg8PxvlO6WRTf9MyLnqscKf0t3P73tNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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