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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f3d07079f103c0af9b0b7af55a740512ab4fe11bab6747361aa9a30783f267e' 
  AND token = 'EFS9F9fQXzk79XzfYuEnDRsGtKSSAuXLH5OOJTKU+M8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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