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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1bbea111bde3a5180bb3e18deff70799e936d8800e67cb405f82d6f0f2048b80' 
  AND token = '5C4P27irFRo8SG6GkOpJ3ypzUz3DwqJbysGv6mKV5e0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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