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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a41fc1a3b0c261d95f51c18f98d6b46da09961f8294f30170f80c3d9af5fb712' 
  AND token = 'W5oWts990izUWT5wDVKj/nSebXAOHOlscwtog8egQu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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