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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef2679fc6929d8701c5806f9eab42d5e4fe8a637d4c6499e3dd6c600d515b850' 
  AND token = 'AbsGSoxHd5xWUlqLRkrm3X6qRKC9CUpNIbuiVnT0+gM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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