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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f41c2cdabaffd86d464b6de4795ee64c224d04cca1b46232a48a6e00b4f87a1' 
  AND token = 'TDDudj6kItAlRiZw88yzz76AS87EJnqgGEzyJNZ1eRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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