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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4cb06b889872385cd22d04bf8edf4ee158c88599e184b7f4bb7db1334eb61931' 
  AND token = 'aN++AoQsCjdi8PBvxho8xaZG9ZtRB5yoP13SN2S9/6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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