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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d0bd73e5e1c3f417d5ace40d173dbef284a9e40220f657d1153d2b27d61829f' 
  AND token = 'AvZZHB5tLV8JRcgflRcpibvOXSX2f7HL7xGZpW/WWOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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