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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d37ab1bfbcc0d6c2c0d1f3040fb276587df1e98e6d01778247c2954b1c52d99' 
  AND token = 'r3erT2H9oc8zQJsVDWADNfkjLMUmepQvrnliiWeoNxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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