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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42c3a05f4a9d75f5becf0b920a21975b15da28c4029c4f3d54655e31d33d9133' 
  AND token = '2ZQ1Lyi84cpRps1etsGFLTbk3CTZE9NBXqiijVCRyL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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