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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '083d3f67c8f71cdf4488ca7d0c52f8aacea5beecd3b35b3b5d52d2be46a02120' 
  AND token = '6lRjV9ayY3P3/bbSNuGfddxlQdHwTlXE335dlARvYTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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