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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3a774f7b647c557557a422cbf9a7f40495a6a19cf8ea14f3a08284cdf5f1abd0' 
  AND token = 'j23LERXcXx6toCugZYdl5oRQRECqVmzsg6Ztl8lbrZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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