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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e0da8bc87e6b856e912e054ba7990450b96c532deef471f3f9cb9fb728ce66b' 
  AND token = 'jrBUN70P86X0cKzh0zckX3XZcUZhVmNVytKOOGOdl4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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