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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf3079d518413c1c63d4b9aa5abe735588323db531244acb90931dc24a142346' 
  AND token = 'IYaMoLpPcPulmSygTbQf4CCRjriJ1lOJt4NhQg5vmwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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