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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2cd6676e4612e46b09cf95bd7b6456566cb896c902c12325bad70d62c7057443' 
  AND token = '/YWJiAkDx34cvvBe+7DujoqEexHRXkegD1IbBlklaIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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