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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a3e9623c570eeb46866a60f21ef8f86cb3fa1f57c0e93fee43e8e6066844b3ef' 
  AND token = 'h0yN3Pqja4US/afKzaVuinWp/94wl44EsYQFGFKEAC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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